Patents by Inventor Otto C. Jahnke

Otto C. Jahnke has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Internal boundary layer ceramic compositions
    Patent number: 4337162
    Abstract: An improved polycrystalline semiconducting ceramic composition comprises an alkaline earth metal titanate doped with a hexavalent metal oxide such as (MO.sub.3)(Bi.sub.2 O.sub.3).sub.x where M is tungsten or molybdenum, and x ranges from 0 to 7, which is liquid phase sintered with lead germanate to produce internal insulating boundaries. The composition is fine grained and provides thin-layer, multi-layer capacitors that exhibit high dielectric constant values, low dissipation factors, and low temperature and voltage coefficients of capacitance.
    Type: Grant
    Filed: May 20, 1980
    Date of Patent: June 29, 1982
    Assignee: University of Illinois Foundation
    Inventors: David A. Payne, Sang M. Park, Otto C. Jahnke
  • Reduced alkaline earth metal powders and process for producing same
    Patent number: 4284521
    Abstract: An improved polycrystalline semiconducting ceramic composition can be produced from a novel powder which comprises a reduced alkaline earth metal titanate doped with a hexavalent metal oxide such as (MO.sub.3) (Bi.sub.2 O.sub.3).sub.x where M is tungsten or molybdenum, and x ranges from 0 to 7. This powder, which has a mean particle size on the order of less than 10 microns, may be liquid phase sintered with lead germanate to produce a ceramic composition having an extremely fine grain size. By reducing the earth metal titanate (either chemically or gaseously) prior to the liquid phase sintering with lead germanate, particle or grain size growth is substantially eliminated, and the grain size of the ceramic composition is similar to the original particle size of the earth metal titanate.
    Type: Grant
    Filed: July 23, 1980
    Date of Patent: August 18, 1981
    Assignee: Ferro Corporation
    Inventors: David A. Payne, Sang M. Park, Otto C. Jahnke
  • Method of producing internal boundary layer ceramic compositions
    Patent number: 4237084
    Abstract: An improved polycrystalline semiconducting ceramic composition comprises an alkaline earth metal titanate doped with a hexavalent metal oxide such as (MO.sub.3)(Bi.sub.2 O.sub.3).sub.x where M is tungsten or molybdenum, and x ranges from 0 to 7, which is liquid phase sintered with lead germanate to produce internal insulating boundaries. The composition is fine grained and provides thin-layer, multi-layer capacitors that exhibit high dielectric constant values, low dissipation factors, and low temperature and voltage coefficients of capacitance.
    Type: Grant
    Filed: March 26, 1979
    Date of Patent: December 2, 1980
    Assignee: University of Illinois Foundation
    Inventors: David A. Payne, Sang M. Park, Otto C. Jahnke